chore: try to fix shims

(for npm package usage)

packages/app/types/shims.d.ts

@@ -1,8 +1,8 @@
 import Vue from 'vue'
+import { $Fetch } from 'ohmyfetch'
+import { Nuxt } from '../dist'
 
 declare global {
-    import type { $Fetch } from 'ohmyfetch'
-
     // eslint-disable-next-line no-var
     var $fetch: $Fetch
 
@@ -29,9 +29,9 @@ declare module '*.vue' {
 }
 
 declare module 'vue' {
-    import type { Nuxt } from '../dist'
-
     interface App {
         $nuxt: Nuxt
     }
 }
+
+export {}

packages/nitro/types/shims.d.ts

@@ -1,5 +1,7 @@
-declare global {
 import type { $Fetch } from 'ohmyfetch'
+import type { Storage } from 'unstorage'
+
+declare global {
   // eslint-disable-next-line no-var
   var $fetch: $Fetch
   namespace NodeJS {
@@ -10,7 +12,6 @@ declare global {
 }
 
 declare module '#storage' {
-  import type { Storage } from 'unstorage'
   export const storage: Storage
 }
 
@@ -20,3 +21,5 @@ declare module '#assets' {
   export function statAsset(id: string): Promise<AssetMeta>
   export function getAsset<T=any>(id: string): { read: () => Promise<T>, meta: AssetMeta }
 }
+
+export {}